# -*- coding: utf-8 -*-#
#-------------------------------------------------------------------------------
# 建立者:        黄周云  
# Name:         question04
# Description:
# Author:       ASUS
# Date:         2019/1/17
#-------------------------------------------------------------------------------

from click._compat import raw_input
while True:
    x=raw_input('请输入表达式: ')
    if x=='end':
        break;
    print("计算结果:",end="  ")
    print(eval(x))                  #输出计算结果




